:root {
  --primary-color: #3b82f6;
  --secondary-color: #4c8c2b;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  --text-dark: #0f172a;
  --text-muted: #64748b;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --transition: all 0.3s ease;
  --font-heading: "Cormorant Garamond", serif;
  --font-body: "Lato", sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: var(--font-body);
  background: var(--bg-light);
  color: var(--text-dark);
}

header,
footer {
  width: 100%;
}

/* Navbar */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: var(--primary-color);
  color: #fff;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}
.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 1.5rem;
}
.nav-brand {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
}
.nav-menu {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}
.nav-menu a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  position: relative;
}
.nav-menu a::after {
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  background: #fff;
  bottom: -3px;
  left: 0;
  transition: var(--transition);
}
.nav-menu a:hover::after {
  width: 100%;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}
.nav-toggle span {
  width: 25px;
  height: 3px;
  background: #fff;
  margin: 3px 0;
  transition: var(--transition);
}

/* Header */
.header {
  margin-top: 70px;
  background: #3b82f6;
  color: #fff;
  text-align: center;
  padding: 1rem;
  font-size: 1.1rem;
}

main {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 15px;
}

/* Container for inputs and results */
.container {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.box,
.results {
  background: var(--bg-white);
  flex: 1;
  min-width: 280px;
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
}

.field {
  margin-bottom: 12px;
}
.field label {
  display: block;
  font-weight: bold;
  margin-bottom: 4px;
}
.field input,
.field select {
  width: 100%;
  padding: 8px;
  border-radius: 4px;
  border: 1px solid #ccc;
}
.field.inline {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}
.inline input {
  width: 100px;
}
.radio-group {
  margin: 12px 0;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}
.buttons {
  margin-top: 15px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
button {
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  background: var(--secondary-color);
  color: #fff;
  cursor: pointer;
  transition: var(--transition);
}
button.clear {
  background: #999;
}

.results h2 {
  background: var(--secondary-color);
  color: #fff;
  padding: 10px;
  border-radius: 5px;
  margin-top: 0;
}
.results p {
  margin: 8px 0;
  font-size: 15px;
}

/* Footer */
.footer-bottom {
  background-color: var(--primary-color);
  color: #fff;
  text-align: center;
  padding: 1rem 0;
  margin-top: 3rem;
}
.footer-bottom a {
  color: #fff;
  margin: 0 5px;
  text-decoration: none;
}
.footer-bottom a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 900px) {
  .container {
    flex-direction: column;
  }
}
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    background: var(--primary-color);
    flex-direction: column;
    gap: 1rem;
    padding: 2rem;
    transition: var(--transition);
  }
  .nav-menu.active {
    left: 0;
  }
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
}
.about-container {
  width: 70%;
  margin: auto;
  padding: 20px;
}

.about-section {
  background: #fff;
  margin-bottom: 30px;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
}

.about-section h2 {
  text-align: center;
  color: #3f7cf3;
  margin-bottom: 15px;
  font-size: 24px;
}

.about-section p {
  margin-bottom: 12px;
  font-size: 15px;
}